you can't file IL-1040-X until the federal 1040-X is approved. then on your IL 1040-x, you enter the
date the federal change was accepted. also Illinois requires additional documentation which will require you to mail in the amended form
What must I attach to my Form IL-1040-X?
If you are filing Form IL-1040-X because you filed a federal Form 1040X to report a federal change other
than an NOL carryback, you must include a copy of that form and proof of federal finalization.
If your federal change resulted in an overpayment, proof of federal finalization includes a copy of the notification you received from the IRS stating that they accepted the changes shown on your federal Form 1040X; e.g., a refund check, “Statement of Account,”
as to whether you can claim yourself even if your parents don't claim you requires that certain conditions be met
my understanding is you are a dependent if you meet the test below even if not claimed.
You could be claimed as a qualifying child if all these tests are met
• You have the same principal abode as the other party for more than ½ the tax year. Temporary absences like for school are ignored
• If not a full-time student (any part of any 5 months – in a letter ruling the IRS allowed the month the student registered even though classes didn’t start until the next month), you’re under 19 at the end of the tax year. If a full-time student, you're under 24 at end of the tax year.
• you haven't provided over ½ your own support
• you didn't file a joint return unless there was no tax liability but merely filing jointly to facilitate refund of taxes withheld or estimates paid
Or as you could be a qualifying relative if all these tests are met
You’re related to the other person or, if not, lived with the other party for the entire year and
• your gross income for 2021 is less than $4,350
• the other party provided over ½ your support
• you aren't a qualifying child of another taxpayer
